Modifing stock exhuast to sound and go better - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 7 (permalink) Old 05-16-2010, 11:32 PM Thread Starter
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Modifing stock exhuast to sound and go better

I have just purchased a 2008 V starr 1100 custom and it has standard pipes on it. Is there any one out there that has "modified" standard pipes to get a better sound and increase performance.
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post #2 of 7 (permalink) Old 06-13-2010, 08:34 PM
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There are 3 sections to these pipes. You can gut them out 1 at a time, tricky. Recommend going to ebay and get a set to work on. I got a set reasonable, take- offs from an 01' that had no cat. conv., makes a difference. Get a hole saw larger than the inside pipe and cut around the outer dia. then work the internal pipe out, can be a pain, but comes out. A ways in you will see a baffle with 3 holes in it now that the pipe is out of it. I left my baffle in. you can go further.You don't have to jet the carbs to do this but I did, WOW! I can get better details if you need them. I expect the pipes are similar to US ones. Rol

Last edited by Rolstar; 06-13-2010 at 08:38 PM.
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post #3 of 7 (permalink) Old 06-13-2010, 09:35 PM
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Exhaust

Sneeze,

It is my understanding just installing or modifying the muffler will not gain any noticable performance change. I believe to gain power you need to improve air flow in and out of the engine. Plus rejetting the carbs to rebalance the fuel air mixture.

Most seem to feel if you only change exhaust rejetting is not required. I see some that feel any change in air flow in or out of the engine requires rejeting. Here is some reading on exhaust.

http://www.sloneservices.com/SilverB...Q-03.htm#Stock

Here is a picture of a three hole mod on a v star 650.

http://www.650ccnd.com/drillout.htm

This one claims no rejetting. I would consider aftermarket.

http://650ccnd.com/pipe1.htm

Dave
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post #4 of 7 (permalink) Old 06-14-2010, 05:04 PM Thread Starter
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Quote:
Originally Posted by Rolstar View Post
There are 3 sections to these pipes. You can gut them out 1 at a time, tricky. Recommend going to ebay and get a set to work on. I got a set reasonable, take- offs from an 01' that had no cat. conv., makes a difference. Get a hole saw larger than the inside pipe and cut around the outer dia. then work the internal pipe out, can be a pain, but comes out. A ways in you will see a baffle with 3 holes in it now that the pipe is out of it. I left my baffle in. you can go further.You don't have to jet the carbs to do this but I did, WOW! I can get better details if you need them. I expect the pipes are similar to US ones. Rol
Thanks Linerdave this is really helpful. I am keen to see how it goes. Happy riding
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post #5 of 7 (permalink) Old 06-14-2010, 05:05 PM Thread Starter
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Thanks Rolstar
Great advice I will see what I can do the drawing is great and will help in the mod.

Thanks again happy riding
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post #6 of 7 (permalink) Old 06-14-2010, 09:56 PM
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You may be able to take the pipes you have an attach a Strat to it for an instant gain in power and torque without having to do any other modifications.
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post #7 of 7 (permalink) Old 06-20-2010, 06:57 AM
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I've done this mod to the stock pipes on my old 650, here's the youtube vid.

[YOUTUBE]http://www.youtube.com/watch?v=EI1KsX9Xfo0[/YOUTUBE]

I kept an eye on the spark plugs and all for hundreds of miles after, never had any issue, fuel efficiency stayed the same too, hence this mod has no measurable effect on the engine or fueling.
Sounds waaaaaaaaay better than the stock "sewing machine" sound, sounds like a real motorbike now.


Then I got an 1100, didn't want to start hacking it up because it was so shiny and new and perfect, but several months on (2 weeks ago) I said feck it, let's do this thing. Only drilled 4 10mm holes in the end of each pipe though, as I've just ordered a dynojet stage 1 rejet kit online today, so am going to completely (almost anyway) the stock pipes and want to be sure I'm not going to melt the pistons with a lean fuel mixture.
Made a video of the before & after, but haven't stuck it up on youtube yet.
I'm not impressed by the drilled pipes though - I've lost the quiet power the 1100 had... before I could take off real quick and nobody knew the bike was making an effort as it was pure quiet as stock, but now with the drilled pipes everyone hears the engine making an effort.
The fuel efficiency is still exactly the same as before, 142 miles to 12.5 litres (I always fill up as I'm just going into the reserve), so by that logic the fuel mixture hasn't changed.
I'd be very worried though if I just gutted the stock pipes altogether (stock pipes look better than any of the aftermarkets if you ask me) or replaced the pipes with aftermarket ones, and didn't rejet to suit....

From what I've read, there are 3 main types of exhaust.. a) very restrictive stock pipes (quiet), b) straight throughs (no restrictions) and c) performance pipes (small bit of restriction).
Apparently straight thrus (with correct jetting) do give noticeable better performance than stocks, but not as good as performance pipes. Apparently performance pipes have a small bit of restriction in them, in the right place & way of course.
But this is just a summary of what I've read, I know SFA about them myself.

Lowering the tone since 1969
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